[CMake] generating code from compiled program

[James Bigler]

On Sep 26, 2007, at 10:11 AM, Juan Sanchez wrote:

> Hello James,
>
> I'm curious why your target name is ExtractSymbolsFromXML, but your
> dependency is ${ExtractSymbolsFromXML_exe}.
>
> Shouldn't your dependency be the name of the target?

I tried both, and neither work.

> In addition, if you add a custom command, don't you have to have use
> add_custom_target as well.
>
> For example:
> ADD_CUSTOM_COMMAND(
>   OUTPUT main.pdf
>   DEPENDS main.ps
>   COMMAND ps2pdf
>   ARGS    main.ps
> )
>
> ADD_CUSTOM_TARGET( Docs ALL
>   DEPENDS main.pdf
> )

I thought that by having the generated source file be a dependency on  
a library it would pull it in:

ADD_CUSTOM_COMMAND(
   OUTPUT mysource.cc
   ...
   )

ADD_LIBRARY(mylib mysource.cc)

I'll try and play around with ADD_CUSTOM_TARGET, but I hate how it  
always seems to run (though I may have been using it wrong).

James

>
> James Bigler wrote:
>> Has anyone any examples of building a compiler (of sorts) and  
>> using that
>> compiler to generate code then integrated into another CMake target?
>>
>> Thanks,
>> James
>>
>> James Bigler wrote:
>>> I have a program built within CMake that generates some code.  I  
>>> need
>>> this generated code to compile some other libraries.  The problem  
>>> I'm
>>> having is setting the dependency of the generated source file to its
>>> compiler.  This is what I have currently:
>>>
>>>   # This is the helper compiler
>>>   ADD_EXECUTABLE(ExtractSymbolsFromXML ExtractSymbolsFromXML.cc)
>>>   TARGET_LINK_LIBRARIES(ExtractSymbolsFromXML Dataflow_Network)
>>>
>>>   # Get the full path to the ExtractSymbolsFromXML executable
>>>   GET_TARGET_PROPERTY(ExtractSymbolsFromXML_exe  
>>> ExtractSymbolsFromXML
>>> ${CMAKE_BUILD_TYPE}_LOCATION)
>>>   # Get the path to the executable, so that I can stuff the  
>>> generated
>>> file in the same place
>>>   GET_FILENAME_COMPONENT(binary_path ${ExtractSymbolsFromXML_exe}  
>>> PATH)
>>>   SET(Loader_cc "${binary_path}/Loader.cc")
>>>   SET_SOURCE_FILES_PROPERTIES(
>>>     ${Loader_cc}
>>>     PROPERTIES GENERATED TRUE
>>>     )
>>>   ADD_CUSTOM_COMMAND(
>>>     OUTPUT ${Loader_cc}
>>>     COMMAND ${ExtractSymbolsFromXML_exe} -o ${Loader_cc}
>>>     # This is where I get hung up.
>>>     MAIN_DEPENDENCY ${ExtractSymbolsFromXML_exe}
>>>     COMMENT "Generating static loader file: ${Loader_cc}"
>>>     )
>>>
>>>   ADD_LIBRARY(StaticHelper Loader.h ${Loader_cc})
>>>
>>> ==================================================================
>>> I can't seem to get the dependency for ${Loader_cc} right.  Any  
>>> ideas of
>>> what I'm doing wrong?
>>>
>>> Thanks,
>>> James